PARCC - Partnership for Assessment of Readiness for College and Careers Averages and Rounding Practice Questions 1

Question 1

What is the mean of the data set: 45, 63, 27, 54, 36?

Accepted Answer

45

Answer

Add all values: 45 + 63 + 27 + 54 + 36 = 225. Divide by the count of 5 values: 225 ÷ 5 = 45.

Question 2

A student scored 78, 84, 90, and 72 on four quizzes. What score does the student need on a fifth quiz to achieve an average of 82?

Accepted Answer

86

Answer

The target sum for 5 quizzes at an average of 82 is 82 × 5 = 410. The current sum is 78 + 84 + 90 + 72 = 324. The needed score is 410 − 324 = 86.

Question 3

Round 7.3641 to the nearest tenth.

Accepted Answer

7.4

Answer

The digit in the hundredths place is 6, which is ≥ 5, so the tenths digit rounds up from 3 to 4, giving 7.4.

Question 4

Six students scored 88, 94, 76, 82, 91, and 79 on an exam. What is their mean score?

Accepted Answer

85

Answer

Sum of scores: 88 + 94 + 76 + 82 + 91 + 79 = 510. Divide by 6 students: 510 ÷ 6 = 85.

Question 5

Round 0.25648 to the nearest thousandth.

Accepted Answer

0.256

Answer

The digit in the ten-thousandths place is 4, which is < 5, so the thousandths digit stays as 6, giving 0.256.

PARCC Practice Test